conceivable (adj.)youdaoicibaDictYouDict[conceivable 词源字典]
mid-15c. (implied in conceivableness), from conceive + -able. Originally in a now-obsolete sense "that can be received." Meaning "that can be imagined" is attested from 1620s (in conceivably).[conceivable etymology, conceivable origin, 英语词源]